42. Which of the following is not true regarding graded potentials? a. They are

Question

42. Which of the following is not true regarding graded potentials? a. They are generated by ligand-gated channels. b. They are typically presynaptic potentials. c. They are both excitatory and inhibitory d. They decrease in magnitude as they move away from the stimulus point occurs when a neuron is stimulated at more than one dendrite. 43. a. synaptic delay c. spatial summation d. synaptic potentiation 44. Which of the following is not a chemical dlass of a. amino acid b. nucleic acid c. monoamine d. neuropeptide 45. A major excitatory neurotransmitter in the CNS is. a. glutamate b. GABA c. endorphin d, histamine 46. The natural opiate of our body is b. GABA C. endorphin d. histamine 47. Prozac used for the treatment of depression exerts its effects by keeping the concentration of serotonin elevated in the synapse. These drugs exert their effects by a. inhibiting reuptake of serotonin by presynaptic terminals b. inhibiting the enzyme that break down serotonin c. inhibiting diffusion of serotonin away from the synaptic cleft d. all of the above 48. An inhibitory postsynaptic potential (IPSP) is not associated with b. a change in sodium ion permeabilty c. opening of ligand-gated chloride channels d. binding of GABA to its ionotropic receptons 49. Which of the following is incorrect regarding G-protein linked receptors? a. They include monoamine receptors. b. Their effects are indirect and prolonged c. They activate second messengers such as Ca and cAMP d. They are typically ligand-gated ion channels 50. Which of the following does not bind to caicium to regulate muscle or neuronal activity? a. troponin d.

Explanation / Answer

Ans 42:- (a) they are generated by ligand gated channels.

Explaination:- Ion channels responsible for graded potentials may be ligand-gated (extracellular ligands such as neurotransmitters), mechanosensitive, or temperature sensitive channels, or may be channels that are gated by cytoplasmic signaling molecules.

Ans 43:- (c) Spatial summation.

Ans 44:- (b) Nucleic acid.

Ans 45:- (a) Glutamate.

Explaination:- Glutamate is the most common excitatory neurotransmitter in the brain; involved in learning and memory; may be involved in schizophrenia

Ans 46:- (c) Endorphins.

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